NASA/GSFC July 27, 2000 COScos.colorado.edu/Documents/MSR/COS_MSR_2000_07_CU.pdf · Hubble Space Telescope James Green July 27, 2000 COS Monthly Status Review July 27, 2000 NASA/GSFC

COSMonthly Status Review

Cosmic Origins SpectrographHubble Space Telescope

James GreenJuly 27, 2000

COS

Monthly Status Review

July 27, 2000

NASA/GSFC




AgendaProgress Summary Since Last Monthly J. Green

Optics Development Status J. Green

Optics Test Status J. Green

UCB FUV Detector Status J. GreenUCB FUV Detector Performance Status J. Green

CU Software Activities Status J. Green

Schedules J. Green

Upcoming Events/Activities J. Green

CU Issues & Resolution Plan J. Green

STScI Presentation M. McGrath

BATC Presentation D. Hood

Financial Splinter GSFC/Ball/CU




Progress Summary Since Last Monthly

• Took delivery of flight G140L gratings from JY.

• Began incorporating NUV channel and FF/Wave Cal SS into TAACOS.

• Continued G140L test preparations.

• Worked issues surrounding CM release of OP-01.

• Completed launch delay proposal.

• UCB made final selections on flight anodes.

• UCB completed BBA #1/MCP optimization.

• TDC-X & TDC-Y board stuffing began at J&T.




Optics Development Status - NUV Mirrors

• Tinsley:– Current delivery Plan for flight optics (recent changes in bold):

– We speak with Tinsley weekly to monitor their progress.

– Recent delays due to technical challenge in meeting figure requirements acrossfull clear aperture.

• TA-1 mirrors have been coated at GSFC and are ready for delivery to Ball.

Item Previous DueDate

New Date Slip New Date forSpares

NCM1 7/21/00 8/7/00 2 weeks 8/30/00

NCM2 7/14/00 8/7/00 3 weeks 8/30/00

NCM3a,b,c 7/24-31/00 8/7/00 2 weeks 9/10/00




Optics Development Status - Gratings

• JY has restored their efficiency test system and can now test in-house.

• G140L gratings (qty=2) picked-up by CU on Friday, June 30.

• Present grating delivery plan (no change since last month):

Item Delivery Date Coating Datesat GSFC

Test Dates Planned TestLocation

G140L Done In process 8/00-10/00 CU

G160M 11/00 11/00 12/00-3/01 CU

G140L-Blazed 11/00 11/00 1/01 CU

G185M 8/00 8/00 9/00 GSFC (?)

G225M 11/00 11/00 12/00 GSFC (?)

G285M 12/00 12/00 1/01 GSFC (?)

G230L 1/01 1/01 2/01 GSFC (?)




Optics Development Status - NUV Testing at GSFC

• Over the past several months, we thought we had worked out an agreementto have GSFC perform optical test of the NUV gratings.

• The GSFC optics group has recently informed the HST project that theylack the human resources to do the work.

• CU, the HST project, and the GSFC optics group are meeting today todiscuss and work the problem.




Optics Development Status - G140L Efficiency

FM 732 (G140L C)

0

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w avelength (nm)

rela

tiv

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c alcul_0

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measure_1

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Poly. (calcul_1)

- As measured by JY-




COS FUV Grating Test Status 7/27/2000

• G130M Gratings

– Testing and data analysis has been completed for both gratings.

– Both gratings are satisfactory in all respects.

– G130M-C calibration report is finished, G130M-B calibration report will be finishedby end of month.

– G130M-B appears to have slightly better performance.

• G140L Gratings

– G140L-ETU testing indicated small blaze error - this was corrected prior to etchingthe flight gratings.

– Flight G140L laminar optics have been delivered to GSFC for coating.

– First G140L grating has been coated and will be picked up today.

– Test facility will be ready for the optics when bonding of first optic is completed.




G130M Test Results

Wavelength (Å)(Source)

G130M-BGrating Efficiency

G130M-CGrating Efficiency

RequiredEfficiency

1164 (Kr-I) 38.6±1.8 37.1±1.3 ? 0.271236 (Kr-I) 44.8±2.2 42.0±1.4 ? 0.371304 (O-I) 45.4±1.5 43.3±1.6 ? 0.361356 (O-I) 50.1±2.9 46.5±2.4 ? 0.361411 (O-I) 50.6±1.7 47.8±1.7 ? 0.361470 (Xe-I) 50.2±2.1 46.5±2.0 ? 0.36

GratingID

SourceWavelength

(Å)

Scatter/Å(Upper

Estimate)

MaximumAllowableScatter/Å

G130M-B 1199-1219 1.8↔10-5 2.0↔10-5

G130M-C 1199-1219 1.6↔10-5 2.0↔10-5

Grating Resolution

Grating Efficiency

Grating Scatter

WavelengthG130M-BFWHM(mÅ)

G130M-BResolution

λ/∆ λ

G130M-CFWHM(mÅ)

G130M-CResolution

λ/∆ λ

RequiredResolution

1219.49Å 51.9mÅ 23500 52.9mÅ 23000 ? 200001283.70Å 56.9mÅ 22600 59.2mÅ 21700 ? 200001382.05Å 53.8mÅ 25700 62.3mÅ 22200 ? 20000




G130M Grating Efficiency vs. Wavelength




G130M-B Resolution Test Image - 1283.7Å




G130M-C Resolution Test Image - 1283.7Å




Sample Grating Scatter at 1200Å for G130M-C




Overview of FUV DetectorAssemblies

• DEB - (Detector Electronics Box)– DCE (Detector Control Electronics))

– TDCs (Time-to-Digital Converters)

– HVPS (High Voltage Power Supply)

– LVPC(Low Voltage Power Converter)

• DVA - (Detector Vacuum Assembly)– VHA (Vacuum Housing Assembly)

• Detector Door Mechanism

• Ion Pump Assembly

– DBA (Detector Backplate Assembly)• Amplifiers

• HVFM (High Voltage Filter Module)




FUV Detector SubsystemBlock Diagram

• UCB is under contract todeliver 1 flight FUVdetector subsystem and 1flight-spare detectorsubsystem.




UCB FUV Detector Status - Personnel Issues

• Raffanti still supporting UCB ~ 1 day/week plus consulting via dailyphone conversations.

• Baja Technologies is still supporting electrical systems test andintegration preparations.

• MAG Systems has temporarily completed COS activities and willpick-up spare detector assembly and test in August.

• A new Post-Doc, Adrian Martin, has joined UCB and is supportingCOS DVA development.




UCB FUV Detector Status - Facilities

• Old building renovations arewell under way.

• All COS personnel havemoved to office and labspace in the new building.

• New cleanroom has beenassembled and is in“commissioning phase.”

• We expect to start detectorwork in this facility ~7/31.

• Detector electronics test labfully operational in newbuilding.




UCB FUV Detector Status - Detector Vacuum Assembly

• DVA door assembly build-up has started.• Flight door motor/gear-box assembly was TQCM contamination

certified at CU.• Vacuum Box, door assemblies, etc. are being assembled, leak checked,

and operationally tested now at UCB.




UCB FUV Detector Status - DVA Continued

• Backplate No. 1 has beenthrough metrology at GSFCand returned to UCB.

• Backplates No’s. 2 & 3 infinal processing now at UCBand scheduled for metrologyat GSFC in early August.




UCB FUV Detector Status - Electronics

• Power Systems (HVPS,LVPC, HVFM):– All are in-house awaiting

next level of integration.

• AMPS:– In-house undergoing

adjustments to addressnon-linearity.

• DCE - A, B, C Boards:– In-house awaiting flight

Actels before start oftemperature cycle testing.

• Flight Harnass:– Nearing completion.




UCB FUV Detector Status - Electronics Summary

ACTIVITY Electronic BoardAmps HVFM HVPS LVPC DCE-A DCE-B DCE-C TDC-X TDC-Y

Parts List C C C C C C C C CSchematic C C C C C C C C CParts Stress Analysis NS NA NA NA NA C C C CWorst Case Analysis NA NA NA NS NA C C C CBoard Thermal Analysis C NS NS NS C C C NS NSRelease Layout C C C C C C C C CBoard Fabrication C C C C C C C C CKit Parts C C C C C C C S SBoard Coupon Testing C C C C C C C C CStuff Boards C C C C C C C S SBoard Workmanship Acceptance C C C C C C C NS NSBoard Engineering Acceptance C C C C C C C NS NSEngineering Test & Acceptance C C C C C C C NS NSTemperature Cycle Test S C C C NS NS NS NS NSVoltage Margin Test S NA NA NA NS NS NS NS NSFinal Acceptance Test S C C C NS NS NS NS NS

Legend C = Complete NA = NotApplicable

S = Started NS= not started

Changes since last MSR in Bold




UCB FUV Detector Status - Actels

Changes since last MSR in bold

• First UCB Actel review package was shipped 7/21/00.

ACTIVITY ACTEL FPGA’sAmps HVFM HVPS LVPC DCE-A DCE-B DCE-C TDC-X TDC-Y

Initial ACTEL Design NA NA NA NA C C NA C CACTEL Peer Review NA NA NA NA C C NA C CEnd-to-end System Simulation NA NA NA NA S S NA NS NSFPGA tests with ETU electronics NA NA NA NA C C NA S SRelease ACTEL schematic/burn NA NA NA NA NS NS NA NS NSLegend C = Complete NA = Not

ApplicableS = Started NS= not started




UCB FUV Detector Status TDC

• 4 TDC-X boards are partially stuffedat J&T now.

– Final parts issues are beingaddressed.

– UCB will likely install some partsafter delivery from J&T.

• TDC-Y board stuffing began lastweek.

• 1st X, Y pair expected at UCB ~ 8/4.

• Remaining 6 boards should bedelivered to UCB ~ 8/20.




UCB FUV Detector Status - Systems

• Documentation Update:

– ICD Revision A - released 6/24/00.

– Environmental Verification Plan - released 6/20/00.

– ECO for Revision A QA Plan - in process.

• Mass and Power Updates (no change since last month):

Mass (Kg) Power (W)

CurrentEstimate

SoRAllocation (1)

Margin CurrentEstimate

SoRAllocation (1)

Margin

DVA 19.43 21.5 9.6% 5.68 - -

DEB 13.46 15.3 12% 46.46 - -

Harness 2.7 3.4 20.5% - - -

Total 35.59 40.2 11.5% 52.14 53.0 1.6%

Notes: (1) SoR Revision B allocations




UCB FUV Detector Status - Schedule Overview

Activity/Task Last Month’sPlan

This Month’sPlan

Current Status or Comments

Complete VHA 7/11/00 – 8/3/00 No change On schedule for 8/3 completionTDC Fab 7/5/00 – 8/7/00 Completion

extended to 8/201 pair expected ~8/4, othersdelayed until 8/22 due to partsproblems

DCE Thermal Tests 7/11/00 – 8/2/00 8/1/00 – 8/14/00 Activity delayed pending Actelreview. First DCE Actelpackage was shipped 7/21.

DBA No. 1 Ready forIntegration

8/1/00 8/17/00 Optimization of flight MCPs inBBA #1 overran by 2 weeks.

Start System Integration 9/6/00 9/22/00 2 week slip forecast due toTDC, DCE, and DBA slips.

Deliver Flight No. 1 to Ball 2/7/00 (w/descopes)3/28/00 (w/odescopes)

2/23/00 Descoped delivery date hasslipped 2 weeks.




UCB FUV Detector Status - Descopes Plan for Schedule Recovery• Last month UCB showed a schedule with an unacceptable delivery of 3/28/00. As a

result, we implemented descopes 1 through 3 below. After these 3 descopes, thedelivery moved back to 2/7/00.

• Further schedule erosion at UCB now has moved delivery to 2/23.• New descope candidates are provided below.

Descoped Activity Time Saved Risk Incurred Status1 UV QE detailed calibration 3 weeks Lack of detailed QE knowledge

prior to detector deliveryAdopted6/00

2 Flat field detailed calibration 1 week Lack of detailed flat-fieldknowledge & performanceprior to detector delivery

Adopted6/00

3 Resolution detailed scancheck

3 weeks Lack of detailed resolutionknowledge & performanceprior to detector delivery

Adopted6/00

4 Reduce number of T-Vcycles from 6 to 4

~ 1 week Reduced testing of flight article Proposed7/00



John VallergaJuly 27, 2000

FUV Detector Status Summary

• Two flight MCP sets chosen (4 req’d, 2 flight, 2 spare)

• Four flight anodes chosen (4 req’d, 2 flight, 2 spare)

• Eng. test unit TDC rate and resolution issues resolved

• QE grid design finished and accepted by P.I.

• Move to new SSL Addition almost complete




Detector Performance - Flight MCP status

• Four flight sets required (2flight and 2 spare).

• Two flight sets chosen forBBA #1 and stacks for BBA#2 undergoing stackingoptimization.




Detector Performance - Flight MCP Stacking Optimization

• Minimize gaps between plates that can adversely affect resolution

• Minimize dynamic range input to amplifiers

• We have one full BBA (2 sides) that is acceptable

• We have developed a method for working the bumps out of gain maps




Detector Performance - Flight MCP Stack Optimization




Detector Performance - Flight MCP Stack Optimization




Detector Performance - Flight MCP Stack Flat Field

• UV flat field

• Gain map:




Detector Performance - Flight Anode Selection

• Four Anodes required (2 Flight, 2 Spare)

• All 10 flight anode candidates tested– Visual inspection and bench pulse tests

– Imaging tests with Anode test detector and pinhole mask

– Results compared to S/N 137 which has been characterized in detail

• Five anodes pass test– Four are final flight version

– One is previous version (narrow Y fingers)

• Remainder suffer from imaging non-linearities




Pinhole Mask Image - Flight Anode SN097(1/2 Field of View, 500µm centers)




Pinhole Mask Image - Flight Anode SN105 (1/2 Field of View, 500µm centers)




Detector Performance - Flight Anode Selection

SN Make X resolution(µm) Y resolution (µm) Distortions? ✔=Yes

4800V 4800V X Y

073 Triangle 36.7 28.4 ✔

096 Tyco 26.6 22.9 ✔

097 Tyco 25.6 25.9

102 Triangle* 30.2 30.9

104 Triangle - - ✔ ✔

105 Triangle 27.7 23.3 ✔

106 Triangle 26.0 24.9 ✔

107 Triangle 32.3 28.1

137 Tyco 28.0 22.9

138 Tyco 26.6 29.6




Flight Electronics Optimization

• TDC Eng. Test Unit (ETU) modifications completed

• Tested with– MCP detector

– Flight Anode

– Flight design amplifiers

• Close to achieving resolution specification– TDC not the limiting factor

• Deadtime better than specification

• Resolution loss as a function of rate appears acceptable









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Resolution vs. Rate: COS ETU w/Diode Switch Circuit25m Slit Mask Data, Average of Entire Field

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FEC rate (kcps)

Linear fit: FWHM = 32.5µm + 0.092 x FEC(kcps)





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Livetime test, TDC ETU w/ photons

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Fit: DEC = exp(-7.2µs x FEC) x FEC

FUSE TDC/CDC




CU Software/Operations Efforts• GSE Software Development at CASA-ARL

– COS Science Data Index and Analysis Software - a.k.a. "CEDAR"

– Website gives full details for CEDAR: http://cos-arl.colorado.edu/CEDAR/

• Build II training held at BATC on July 13, 2000.

• Build II completed and released on July 19, 2000.

• Build II installed at BATC on July 20, 2000.

• Build III development currently on hold until specific TLM, Science DataHeader and Science Data Format details - which are captured in DM-06 andDM-02 - are mature enough to allow further code development.

• Build III completion will take approx. 1 month from the time these detailsbecome available.

• In the meantime, CEDAR lead developer, Stéphane Béland, will be workingfull-time at BATC to assist with COS FSW Testing.




CU Software/Operations Efforts

– COS Target Acquisition Simulation Software - a.k.a. "TAACOS"

– Website gives full details for TAACOS: http://cos-arl.colorado.edu/TAACOS/

• Report on TA FSW "Thresholding" issues released on July 26, 2000.

• Revised Report on Recommended TA FSW and Operations Changes to bereleased on August 7, 2000.

• Phase I Software for NUV channel in development and slated for completionin late August, 2000.

• Phase I TAACOS Report for NUV Channel to be completed in earlySeptember, 2000.

• It is expected that Phase I TAACOS will be adequate to answer questionsabout COS TA FSW Requirements. Therefore, Phase II TAACOS softwaredevelopment will likely be put off for at least 6-12 months, so lead developer,Dr. Steven Penton, can move onto other COS SW Tasks (i.e., I&T CalibrationSoftware).




Assistance with FSW Development Efforts at UCB

• DCE FSW Documentation Efforts– Website gives full details of DCE Documentation efforts:

http://cos-arl.colorado.edu/DCE/

• DCE Software Development is well underway, with current code supportingall areas of FUV Detector HW development and test.

• DCE FSW Code Walk-Thru (Part 2 of 3) being held at BATC on July 27 &28. Of the 54 Action Items taken during the first Code Walk-Thru (held onJune 5 & 6, 2000), 35 are closed and 19 remain open, but are beingaddressed.

• DCE FSW "functionality" is approx. 90% complete. The next phase of DCEFSW development involves primarily debugging and requirements & designverification.

• DCE Software Test Procedures are in development, and all unit andcomponent test procedures are expected to be complete by late August, 2000.




COS Schedule for CU

• The detailed CU schedule is available as a separate hand-out.

Task StatusG160M/G140L – Blazed GratingTesting

G160M/G140L-Blazed testscompletion will slip out 2 months dueto delays in grating delivery

CEDAR Software Development Ahead of scheduleTAACOS Software Development On scheduleG140L Gratings & Testing Grating picked up 6/30/00. CU will

be ready to start testing in 8/00.JY Deliveries Presented earlierTinsley Presented earlier




Upcoming Events/Activities

• Take delivery of NUV flight optics from Tinsley.

• Start G140L optical testing at CU.

• Pick-up G185M grating from JY.

• Put OP-01 under “quasi” CM.

• Receive TDC assy’s from J&T.

• Complete BBA #2/MCP optimization.

• Complete DBA #1 processing.

• Burn flight Actels and complete DCE testing.




Questions, Issues & Resolution Plan

• None